please help me fix my bios

Dec 21, 2018
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i have a acer veriton m4618g and i got a new processor with the correct socket but when i plug it in and get 4 beeps i found this means i need to update my bios but when i go to acer they don't have the version i need. is there any way i can fix this or do i need a new motherboard. PS: its a very old computer

also its a i5 ivy bridge cpu